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Date:   Fri, 22 May 2020 16:30:52 -0500
From:   Jeremy Linton <jeremy.linton@....com>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, andrew@...n.ch, f.fainelli@...il.com,
        hkallweit1@...il.com, linux@...linux.org.uk,
        madalin.bucur@....nxp.com, calvin.johnson@....nxp.com,
        linux-kernel@...r.kernel.org, Jeremy Linton <jeremy.linton@....com>
Subject: [RFC 04/11] net: phy: Handle c22 regs presence better

Until this point, we have been sanitizing the c22
regs presence bit out of all the MMD device lists.
This is incorrect as it causes the 0xFFFFFFFF checks
to incorrectly fail. Further, it turns out that we
want to utilize this flag to make a determination that
there is actually a phy at this location and we should
be accessing it using c22.

Signed-off-by: Jeremy Linton <jeremy.linton@....com>
---
 drivers/net/phy/phy_device.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index f0761fa5e40b..2d677490ecab 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -689,9 +689,6 @@ static int get_phy_c45_devs_in_pkg(struct mii_bus *bus, int addr, int dev_addr,
 		return -EIO;
 	*devices_in_package |= phy_reg;
 
-	/* Bit 0 doesn't represent a device, it indicates c22 regs presence */
-	*devices_in_package &= ~BIT(0);
-
 	return 0;
 }
 
@@ -742,6 +739,8 @@ static int get_phy_c45_ids(struct mii_bus *bus, int addr, u32 *phy_id,
 	int i;
 	const int num_ids = ARRAY_SIZE(c45_ids->device_ids);
 	u32 *devs = &c45_ids->devices_in_package;
+	bool c22_present = false;
+	bool valid_id = false;
 
 	/* Find first non-zero Devices In package. Device zero is reserved
 	 * for 802.3 c45 complied PHYs, so don't probe it at first.
@@ -770,6 +769,10 @@ static int get_phy_c45_ids(struct mii_bus *bus, int addr, u32 *phy_id,
 		return 0;
 	}
 
+	/* Bit 0 doesn't represent a device, it indicates c22 regs presence */
+	c22_present = *devs & BIT(0);
+	*devs &= ~BIT(0);
+
 	/* Now probe Device Identifiers for each device present. */
 	for (i = 1; i < num_ids; i++) {
 		if (!(c45_ids->devices_in_package & (1 << i)))
@@ -778,6 +781,13 @@ static int get_phy_c45_ids(struct mii_bus *bus, int addr, u32 *phy_id,
 		ret = _get_phy_id(bus, addr, i, &c45_ids->device_ids[i], true);
 		if (ret < 0)
 			return ret;
+		if (valid_phy_id(c45_ids->device_ids[i]))
+			valid_id = true;
+	}
+
+	if (!valid_id && c22_present) {
+		*phy_id = 0xffffffff;
+	        return 0;
 	}
 	*phy_id = 0;
 	return 0;
-- 
2.26.2

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